The U.S. Geological Survey reported a 3.6 magnitude earthquakecentered in Montgomery County at 5:04 a.m. Friday. The epicenter was in Gaithersburg near I-270 and Route 124 (39.145 degrees N, 77.222 degrees W), USGS reported in a preliminary finding. Its depth was 3.1 miles.
Authorities in the District and Montgomery and Arlington counties said there were no early reports of damage. Still, many residents were dialing 911 to report the rumbling.
